System of line insulation and insulators therefor



Feb 12, 1925;, 1,702,235

5.. STEINBERGER SYSTEM OF LINE INSULATION AND INSULATORS THEREFOR Filed June 27. 1921 INVENTOR ATTORNE Patented Feb. 12, 1929.

UNITED STATES PATENT OFFICE.

SYSTEM OF LINE INSULATION AND IN SULATORS THEREFOR.

Application filed June 27, 1921. Serial No. 480,503.

insulating value the air of the surrounding atmosphere.

Another object of my invention is to provide insulating supports for electrical conductors which for a given voltage may be of minimum practical dimensions and of maximum economy of construction, so that a given size insulator may be capable of withstanding higher voltages than insulators of substantially the same size but of other forms of construction.

Another'object is to provide a construction of line insulators by means of which the are is diverted to ground when a flash-over due to a current surge occurs.

Another object is to provide a construction of line insulator in which an electrode separated by air insulation from ground is connected directly to the line, which latter is supported by a solid dielectric.

Other objects will appear from the subjoined specification and claims.

The ability of any particular insulating device to withstand the electrostatic strains is known to depend far more on the distribution of the electrostatic strains and stresses in the dielectric or insulating material than on the thickness or amount of the said dielectric or insulating material, and I have taken ad-. vantage of this principle in producing my invention.

The insulators are so designed that each one used in the system of insulation will substantially preclude the concentration of electro-static lines of force thereupon and the bodies of air interposed between the metallic elements to be insulated one from the other, are utilized to their full insulatingstrength, thereby permitting a very economical construetion.

In my insulating structure, therefore, I use a small amount only of solid insulating material and a minimum amount of conducting or metallic material, but the insulating and conducting or metallic members are so formed and interrelated as to make it possible to utilize the maximum insulation value of the air.

Referring to the drawings in which the same reference character indicates the same part in the several views: I

Fig. 1 is a vertical section, partly in elevation, of one of my improved line supporting insulators used in my new system of installatlon.

1F ig. 2 is a plan of the supporting ring upon which the insulators are to be mounted in suitable position.

Fig. 3 is a view showing a plurality of insulators suitably installed.

in the drawings, the insulating unit consists of the body A of insulating material of hollow dome-shaped construction having an upper portion B and a serrated outer surface 0, the space S being provided in the under side to form a suitable air insulation.

The mechanical construction is simple and it consists of a supporting stress distributing ring R having two upwardly extending flanges 10 and 11 and a downwardly extending thickened flange 12. The space 15 between the upwardly extending flanges serving as a'groove within which the lower or base portion D of the insulator body fits and into which itis secured either by molding the body of insulating material thereto, as shown, when the insulating body is made of moldable insulating material such as Electrose. This structure may be adapted to support a flange base in the event that the insulating body is made of porcelain, or other similar insulating material, all as well known in the art.

A fitting 20, such as shown, is embedded in the upper bridge portion of the insulator body and extends therethrough, said fitting being flanged as shown so that it may be rigidly anchored in the insulating material. This fitting is provided with a protecting flange 21 extending radially therefrom which protects the upper portion of the insulator body and it is also provided with a screw threaded extension 22 which projects up: wardly and centrally thereof and a screwthreaded cavity 23 extending upwardly from the under side toward the center and also situated centrally thereof.

A washer W is placed over the projection 22 and has a screwthreaded hole so that it may be readily turned down into place. The line supporting element F is provided with a screwthreaded opening so that it may fit over the projection 22 and be screwed down into place against the washer W. This element F is provided with a groove g for the reception of the line wire L,'as shown, and a circumferential groove g? for thereception of the lation, that great and beneficent results will tie wire, as well known. follow. When the line is in operation, the

I also provide a-metal hood preferably insulation is accomplished through, the air of aluminum rovided with an enlarged edge of the surrounding atmosphere and in the 5 51, said hood aving a hole centrally thereof event of a surge coming over the line a diswhich is fitted in place over the projection 22 charge will take place between the electrode and the hood is thus held in place when the C and the surface R of the ring R, which line supporting element F is secured down will thus pass to ground, which results in a into closed position. This hood is effective saving of the insulator and permits the for- 10 as an air gap electrode and stress distributor, mation of a structure in which a minimum and it also protects the insulator body from amount of insulating material may be used the elements of the weather in a manner well and which in its entirety is thus capable of understood. very high dielectric qualities.

The ring shaped element R is provided Aswill be seen, by means of the location of 15 with a stress distributing surface R which is the stress distributing element G on theelecadjacent to the electrode C which latter is trode C in juxtaposition to the metallic secured into place by means of its screwstress distributing element R of the metal threaded end engaging with the screwthread ring R, I have provided means for limiting ed cavit 23 in the fittin 20. the current below the insulator, said means 26 The g obular element (3 is fitted to the lowbeing situated at a greater distance than the er end of the electrode C and is screwthreadlength of the horizontal arc gap between the ed by means of a screwthreaded cavity in the electrode C and the stress distributing surelement G, the walls ofwhich engage with the face R. screwthreads of the downwardly projecting As changes of construction could be made 25 end of the electrode C. The globular elewithin the scope of my invention it is intendment G is designed to be at a greater distance ed that all matter contained in the above defrom the ring shaped stress distributing elescription or shown in the accompanying ment R than the distance of the surface R of drawing shall be interpreted as illustrative the said supporting ring, is from th elecand not in a limiting sense.

30 trode C, so that the arcing will occur be- Having now described my invention, what tween the surface R and the centrall dis I claim as new and desire to secure by Letposed electrode 0, ters Patent is:

The insulator is mounted at any conven- 1. In a high tension system of the type deient place onsuitably constructed cross arms scribed, a plurality of insulators, individual 35 or supports T by means, of a specially deinsulators of said system comprising the folsigned metallic plate M which is circular in lowing: a metallic supporting ring connect shape as shown, at one point of which extends ed to ground, a dome-shaped insulator supa radial projection N extending from the ported on said ring, a metallic conductor sup- Sides Of which are arms 60- and 61 each of porting fitting secured to said insulator, and.

40 which arms has grooves or sockets a and b an electrode connected to said fitting and defor the reception of staples 70, as shown, the pending within said insulator and supportarms or legs of the supports fitting into the ing ring to form an air gap with said supportnotches a and b, as well understood. ing ring.

. When the arms 60 and 61 are used to be 2. Ina system for supporting a high ten- 45 clamped by the staple, the insulatorwill be sion transmission conductor, an insulator havsupported at right angles to the cross arms or ing an inner air chamber formed therein, a Support T whereas when the main project-ing metallic line supporting fitting secured to said portion N is placed parallel with the support insulator, an electrode connected to said fit- .T the insulator is supported at the end of the ting and projecting through the air chamber 50 support in line therewith, and may be thus sein the insulator and a supporting ring for the cured thereto. I insulator surrounding said electrode but The r ng shaped portion of the supporting spaced away therefrom to form an air gap and plate M is provided with a series of bolt holes arranged to co-act with the electrode to direct 0 through which the supporting ring R of the the current to ground when abnormal surges 5 lnsulator structure is secured by bolts, as flow over the conductor.

shown. At the point where the ring support 3. In a system for supporting a high ten- 1s immediately above the cross arm a holding sion transmission conductor, an insulator havscrew or bolt 75 may pass through both the ing an inner air chamber formed therein, a flange of the ring R and the plate M and exmet'allic line supporting fitting secured to said 60 tend down into the support T in order to asinsulator, an electrode connected to said fit- 12 slst in holding the structure in position. ting and projecting through the air chamber I have found by actual test that by the inin the insulator, a stress distributing hood sestallation of such a structure as has just been cured to the fitting and a supporting ring for described in place of the ordinary supporting the insulator connected to ground and sur- 65 and insulating pins in a system of line insurounding said electrode but spaced away therefrom to form an air gap and arranged to co-act with both the electrode and the stress distributing hood when abnormal surges flow over the conductor.

4. In a system for supporting a high tension transmission conductor, an insulator having an air chamber formed therein, a stress distributing supporting ring for the insulator, an electrode extending through the air chamber in the insulator and through the stress distributing supporting ring, and means electrically connected with the electrode for supporting the conductor.

5. In a system of line insulation comprising a plurality of dome-type insulators, grounded ring-shaped stress distributors, means for supporting the base of each insulator upon one of said ring-shaped stress distributors, means for securing a power conductor to said insulators, and an electrode connected to said power conductor and extending through said ring to distribute thestresses between the conductor and said grounded ring-shaped stress distributors.

6. In a system of insulation comprising a plurality of dome type insulators, a conductor secured to said insulators and a grounded ring shaped electrode secured to each insulator body, an electrode secured to the conductor and situated in juxtaposition to the ringshaped electrode.

7. In a system of insulation compriSing a plurality of dome type insulators each supported by a ring-shaped electrode, a conductor secured to said insulators, an electrode mounted on each end of a rod extending through each ring-shaped electrode and connected to the line forming an air gap with the ring-shaped supporting electrode.

In witness whereof, I have hereunto set my hand at the borough of Manhattan, city and State of New York, this th day of J une.

LOUIS STEINBERGER. 

